rajamesandClaude Opus 5.5
9bfd5071d2
Ruled 2026-10-07. BLOCK, BUFFER, UPDATE, SAVE-BUFFERS and EMPTY-BUFFERS are each one kernel request on port 0, by block number only. The node has a window of four slots in its memory, as a v3 VM has; the kernel copies blocks into it, keeps the record of which block is in which slot, and decides when a block is written (v4/system/blocks.c). The node keeps no record and gives the kernel no address, so a request cannot overwrite the node's code. When a block is written stays FORTH-79's: UPDATE marks it. When the chain of devices changes the slots are let go, as in v3. The window is 512 cells more than the two buffers were; the dictionary space ends that much lower, at 13824. MESH.md 8.5 had said, from the review, that a v3 VM's BLOCK is the kernel's buffer. It is not, and the section now says what was reported, what v3 does, and what was ruled. make -C v4 test, sanitize and hosted-check pass; amd64, aarch64 and riscv64 boot, POST 538 of 538, the same hashes on all six: logs/20261007-092835, -093112, -093456. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
89 lines
3.8 KiB
C
89 lines
3.8 KiB
C
/* image.h -- the StarForth nucleus, as its host knows it: where things are
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* in a node that has taken it in, and how a line is handed to that node.
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*
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* The nucleus is text (capsule/ *.v4). tools/mkimage.c assembles it on the
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* build machine and writes two things:
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*
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* - the nucleus as a capsule of F18 code (capsule.h), which is put into
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* an empty node through its port. It is a capsule like any other: in
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* the capsule directory, with a name, a hash and a signature
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* (capsules/v4/nucleus-<width>.f18). docs/v4.0.0/MESH.md section 5.
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* - this description of it, a C file: the addresses a host needs.
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*
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* A node that has taken the nucleus in is sent text as messages and sends
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* back what it prints (v4/include/v4/message.h); nothing here hands it a
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* line.
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*
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* A description is for one cell width, one node size and one pair of stack
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* sizes; v4_image_born refuses one the engine was not built for.
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*/
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#ifndef V4_IMAGE_H
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#define V4_IMAGE_H
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#include "v4/exec.h"
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typedef struct {
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/* what the image was built for */
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unsigned cell_bits, node_words, data_ring, ret_ring;
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/* Where the nucleus waits for a message (v4/capsule/quit.v4, (IDLE)):
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* the node's P is there, blocked reading its ports, when it has nothing
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* to do. */
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v4_cell idle;
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v4_cell fault_table; /* (FAULTS): where a fault goes */
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v4_cell port; /* word address of the node's port (node.h) */
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/* KEY's code: a node whose P is in key_start .. key_end - 1 with no
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* character pending is waiting for one */
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v4_cell key_start, key_end;
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/* the memory-mapped registers (DECOMPOSITION.md section 7; D-4 leaves
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* the map to the loader, and this is the map the image was built with) */
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v4_cell console_tx, console_rx, console_status;
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v4_cell dstack_reg, rstack_reg;
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v4_cell node_error;
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/* the dictionary's two variables: DP holds HERE, a byte address, and
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* LATEST the newest word of FORTH. What lies below HERE, and LATEST,
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* is what the dictionary hash covers (v4/include/v4/boot.h). */
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v4_cell dp, latest;
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/* What COLD returns the system to and FORGET will not go below: two
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* cells, DP and LATEST as they were when the system was complete, and
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* the variable FENCE. The image has them as the nucleus alone; a system
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* that loads capsules when it boots sets them again when it has
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* (v4_image_seal). */
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v4_cell boot_cells, fence;
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/* the block window: the word address of the slots the kernel copies
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* blocks into (v4/blocks.h) */
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v4_cell block_window;
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} v4_image;
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/* The description of the nucleus built from v4/capsule (the generated file
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* defines it). */
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extern const v4_image v4_capsule_image;
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/* The system is complete: what is in the dictionary now is what COLD comes
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* back to, and FORGET will not go below it. */
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void v4_image_seal(v4_node *n, const v4_image *im);
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/* The dictionary hash of a node started from `im`: FNV-1a over its memory
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* below HERE, a cell at a time, low byte first, and then LATEST. It does
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* not depend on the machine: every build of one commit, with one cell
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* width, gives the same hash for the same dictionary. */
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uint64_t v4_image_dict_hash(const v4_node *n, const v4_image *im);
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/* A node newly born (node.h), with the registers the nucleus expects of the
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* node it runs on. Its memory is empty and it is blocked
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* reading its ports: the nucleus is yet to be sent to it. Returns 1, or 0
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* if the description is not for this build of the engine (nothing is then
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* done). */
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int v4_image_born(v4_node *n, v4_exec_state *es, v4_heat *h, const v4_image *im);
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/* 1 if the node is waiting for a character: it is inside KEY and none is
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* pending. */
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int v4_image_waiting(const v4_node *n, const v4_image *im);
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#endif /* V4_IMAGE_H */
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